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US 12,000,744 B2Granted
Method and system for diagnosing fuel tank pressure sensor
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are presented for diagnosing operation of a fuel tank pressure sensor. The methods and systems may include releasing fuel vapors from a fuel tank to an engine when an engine is rotating in a fuel cut out mode while a catalyst temperature is greater than a threshold temperature to determine whether or not the fuel tank pressure sensor is degraded.
Claims20
A vehicle system, comprising:
- a vehicle including an internal combustion engine and a fuel tank, the internal combustion engine including an oxygen sensor, the fuel tank including a pressure sensor configured to monitor pressure in the fuel tank;
- and
- a controller in the vehicle, the controller including executable instructions stored in non-transitory memory that cause the controller to evaluate operation of the pressure sensor based on output of the oxygen sensor.
A method for diagnosing a fuel tank pressure sensor, comprising:
- indicating degradation of the fuel tank pressure sensor via a controller in response to output of an oxygen sensor changing while an output of the fuel tank pressure sensor changes by less than 5%;
- and
- adjusting operation of an evaporative emissions system when indicating degradation of the fuel tank pressure sensor.
A method for diagnosing a fuel tank pressure sensor, comprising:
- closing a canister purge valve and a canister vent valve via a controller to increase pressure in a fuel tank in response to a request to diagnose the fuel tank pressure sensor;
- opening the canister purge valve while rotating an engine unfueled via the controller;
- and
- indicating degradation of the fuel tank pressure sensor via the controller in response to an output of the fuel tank pressure sensor changing less than 5% while an output of an oxygen sensor changes from a first state to a second state when rotating the engine unfueled.
1 more element
Dependencies are inferred from the claim text.